Sewing machine heads



Nov. 22, 1955 w. HEIMANN 2,724,355

SEWING MACHINE HEADS Filed Dec. 2, 1952 2 Sheets-Sheet l Nov. 22, 1955 w. HEIMANN SEWING MACHINE HEADS 2 Sheets-Sheet 2 Filed D80. 2, 1952 M/VF/WUP m W 157 2 1M United States Patent Ofifice SEWING MACHINE I'IEADS Willi Heimann, Kaiserslauteru, Germany, assignor to G. M. Pfalf Aktien Gesellschaft, a corporation of Ger many Application December 2, 1952, Serial No. 323,525 Claims priority, application Germany March 5, 1952 3 Claims. (Cl. 112-458) The invention relates to sewing machines and relates more particularly to the upper part or head of sewing machines.

Sewing machine heads comprise a needle mechanism and a support for the same above the working surface, and

p it is usually desired to encase this head not only for its consuming was the taking apart and re-assembling when repairs were needed, as the various parts of the mechanism had to be aligned in the casing by means of set screws or similar arrangements.

It is among the objects of the invention to avoid the above-noted deficiencies of the prior art, and to provide for a sewing machine head that may easily be assembled and dis-assembled by unskilled or semi-skilled labor.

The invention provides for a frame structure in which the needle mechanism is carried and the drive shaft is journalled, and is assembled in a sub'assernbly operation, and the frame structure with all the parts thereon is sus pended in the casing, in a subsequent operation, and thereafter a cover mounted above. It is accordingly a further object of the instant invention to provide a casing open on top which will receive below its open top aframe structure carrying the needle mechanism and drive shaft, and means for suspending the frame stnicture and mechanism below the open top of the casing.

For a fuller understanding of the nature and objects of the invention, reference should be had to the following detailed description, taken in connection with the accompanying drawings, in which Figure l is an extended perspective view showing a sewing machine head in accordance with the invention;

Figure 2 is a vertical sectional view thereof taken on line II-II of Fig. 3; and

Figure 3 is a side elevational view of the same.

In carrying the invention into effect in one of the embodiments which has been selected for illustration in the accompanying drawing and for description in this specification and referring now particularly to Figure 1, there isprovided a casing generally indicated at 11. The casing 11 is open on top and has a flat surfaced rim 12 surrounding the open top, including a recess 13 for a thread guiding portion of the needle mechanism, and a recess 14 for the hand wheel.

The casing surmounts the working surface 16 of the sewing machine and includes a hollow vertical section 17 that is supported on an extension of the working surface flanges 19 which are spaced below the rim 12 for a certain distance a, and the upper surfaces of which are aligned and define a plane. The bottom of the horizontal section 18 is closed, except for the protrusion of the needle carrier and work depressor.

A frame structure 21 is provided that comprises a platen 22 with a reinforcement rib 23 and which carries bearing structures 24 for the drive shaft 26 that carries the hand wheel of the needle mechanism 27; the needle mechanism includes a needle carrier 29, and there is also provided a work depressor 28.

A transmission 31 is connected to the shaft 26 for transmitting power from the shaft 26 (see Fig. 2). The platen 22 includes bosses 32 that correspond in location to the flanges 19. The lower surfaces of the bosses 32 are aligned and define a plane.

The entire frame structure 21 may be lowered into the casing 11, and the bosses 32 are so arranged that each boss will be in register with a flange 19, each boss resting with its underside against the upper surface of a flange 19. Each flange has a threaded hole 33 and each boss a bore 34, so that upon the emplacement of the frame structure 21 in the casing 11, bolts may be inserted in the bores 34 that are aligned with the holes 33, for remov' ably securing the frame structure 21 in the casing 11. The distance a for which the flanges are spaced below the rim 12 is so dimensioned that the entire frame structure 21 when emplaced in the casing 11 will be below the orbit defined by the rim 12.

A cover 36 is provided that carries pins 37. Each pin 37 protrudes through the cover 36 and carries on its lower end a thread (not shown) that engages a threaded hole 38 which is formed in the rib 23. The pins 3'7 serve to support the thread spools.

lit will be apparent to those skilled in the art that the novel principles of the invention disclosed herein in connection with specific exemplifications thereof will suggest various other modifications and applications of the same. breadth of the appended claims they shall not be limited to the specific exemplifications of the invention described herein.

Having thus described the invention, what I claim as new and desire to be secured by Letters Patent, is as follows:

1. In a sewing machine head having a powered upper shaft, a reciprocating needle mechanism driven by said upper shaft, in combination, a frame structure journalling said shaft and carrying said needle mechanism, a casing arranged to receive said mechanism and including a hollow vertical section and a horizontal section integral with said vertical section and interiorly intercommunicating therewith and being open on top, a rim surrounding said open top throughout said sections, said casing being arranged to receive from above removably said frame structure positionable below the orbit of said rim, and means intermediate said casing and said frame structure and recessed below said rim and operable to suspend said frame structure in said casing below said open top.

2. In a sewing machine head, as claimed in claim l, together with, a cover open on the bottom and having a flange surrounding said open bottom fitting therewith in Patented Nov.22, 1955 It is accordingly desired that in construing the ranged to be put in registry and abutment from above with said flanges for attachment thereto.

References Cited in the file of this patent UNITED STATES PATENTS Colegrove Dec. 24, 1946 Gruman Jan. 2, 1934 Pfalf Oct. 23, 1934 FOREIGN PATENTS Switzerland July 1, 1952 

